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- W2136422503 abstract "Koegel Fontein, about 350 km north of Cape Town, is the only known early Cretaceous anorogenic igneous complex along the volcanic rifted margin of South Africa. The oldest rocks of the complex are minor granite and syenite intrusions at 144 Ma, which were followed by tholeiitic and alkaline basalt dykes, then by microsyenite and quartz porphyry dykes. The youngest and largest igneous unit is the 135 Ma Rietpoort Granite, with an exposed diameter of about 20 km. The country rocks are Mesoproterozoic gneisses of the Namaqua–Natal Province, which in many places were deformed and retrogressed by Pan-African tectonism. Whole-rock δ18O values from the Rietpoort Granite and smaller plutonic units (syenite, granite) are in the range 6–9‰ (outliers 4‰ and 17‰). Quartz δ18O values from all units are in a narrow range and indicate magma δ18O values between 6 and 8‰. In contrast to the syenites and granites, most mafic and silicic dyke units have δ18O" @default.
- W2136422503 created "2016-06-24" @default.
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- W2136422503 date "2013-03-13" @default.
- W2136422503 modified "2023-10-06" @default.
- W2136422503 title "Oxygen Isotope Diversity in the Anorogenic Koegel Fontein Complex of South Africa: a Case for Basement Control and Selective Melting for the Production of Low- 18O Magmas" @default.
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- W2136422503 doi "https://doi.org/10.1093/petrology/egt011" @default.
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